Yeah so i ran out of my brilliant 250ml Big Boy car body filler and decided to buy a 3.5L of body filler by the name of Magic (on ebay) with description Don't let the price fool you - This is a top grade body filler! for 20 squids. Anyway when i come to use the stuff (on car body panels) i found pin holes appearing in the filler once dried. Now i understand this to be air trapped in the the filler during the mixing process or too much hardener added to the mix but not one pin hole appeared when using the whole 250ml of Big Boy car body filler by silverhook over the 3 weeks it lasted using the same amount of harder and the same mixing process as required. So what could be going on?